Preparation process of lithium iron phosphate material

A lithium iron phosphate, preparation technology, applied in the direction of electrode manufacturing, phosphorus compounds, inorganic chemistry, etc., can solve the problems affecting the performance of lithium iron phosphate materials, restricting large-scale production, etc., to achieve shortened sintering time, good repeatability, The effect of increasing production

Inactive Publication Date: 2009-11-11
郑州瑞普生物工程有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, most of the preparation methods of lithium iron phosphate adopt high-temperature solid-phase method, and the early mixing generally adopts solid ball milling or solid-alcohol ball milling. This kind of method can only ensure the mixing of various raw materials to the micron level, which not only affects the performance of lithium iron phosphate materials , which also limits its large-scale production

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  • Preparation process of lithium iron phosphate material
  • Preparation process of lithium iron phosphate material

Examples

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Effect test

Embodiment 1

[0021] Weigh 45 grams of LiOH*H 2 O, dissolved in 300 milliliters of deionized water, added 30 grams of polyethylene glycol, stirred, heated to 60 degrees, dissolved to form a homogeneous solution; weighed 190 grams of FePO 4 *xH 2 O, put in gradually, stir continuously, heat and keep the temperature at 60 degrees; FePO 4 *xH 2 After adding O, add 30 grams of sucrose; heat and stir for 30 minutes to stop heating, and continue stirring until the temperature of the mixed material is lower than 30 degrees; finally put the mixed material into a 100 degree oven for drying, and put the dried material into In the tubular muffle furnace, under the protection of nitrogen gas, the temperature is raised to 350°C in 1 hour, and the temperature is kept constant for 3 hours; the temperature is raised to 600°C in 1 hour, and the temperature is maintained for 7 hours; the temperature is raised to 700°C in 0.2 hours, and the temperature is maintained for 1 hour. ;Finally, after cooling down...

Embodiment 2

[0023] Weigh 45 grams of LiOH*H2O, dissolve it in 300 milliliters of deionized water, add 10 grams of polyethylene glycol, stir, heat to 70 degrees, and dissolve to form a homogeneous solution; weigh 190 grams of FePO 4 *xH 2 O, put in gradually, stir continuously, heat and keep the temperature at 70 degrees; FePO 4 *xH 2 After adding O, add 20 grams of sucrose; heat and stir for 30 minutes to stop heating, and continue stirring until the temperature of the mixed material is lower than 30 degrees; put the mixed material into a 100 degree oven and dry for 4 hours; after drying, put the material into the tube In a type muffle furnace, under the protection of nitrogen gas, the temperature was raised to 500°C in 2 hours, and the temperature was kept constant for 5 hours; after that, the temperature was raised to 700°C in 2 hours, and the temperature was kept constant for 9 hours; the temperature was raised to 750°C in 1 hour, and the temperature was kept constant for 2 hours; Fi...

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Abstract

The invention discloses a preparation process of a lithium iron phosphate material. The process includes the following steps of: step 1: formulating lithium salt solution containing dispersant polyoxyethylene; step 2: putting ferric orthophosphate into the formulated lithium salt solution step by step, continuously stirring the mixed solution to fully react, mix and form colloidal solution in which the total mol rate of lithium to iron is 1.05-1.0; step 3: adding carbon source to the prepared colloidal solution with the adding amount being 20-40g/mol (Li), and drying after uniform mixing; and step 4: sintering the dried material of step 3 under the protection of nitrogen and preparing the finished product of lithium iron phosphate. After being ground and sieved, the lithium iron phosphate material produced by using the preparation process has the carbon content of 3.8-5.2%, compact density of 1.0-1.3g/mL and testing volume up to 150-160mA/h (0.2C). The volume is improved by over 15% compared with that of a solid ball milling method.

Description

technical field [0001] The invention relates to a lithium iron phosphate material, in particular to a preparation process of the lithium iron phosphate which can be used as a positive electrode material of a power lithium ion battery. Background technique [0002] Lithium iron phosphate material has the characteristics of good safety, excellent cycle performance, environmental friendliness, and wide source of raw materials. It is recognized as the preferred cathode material for the new generation of lithium-ion batteries, and has become the key research and development direction of major developed countries in the world today. Due to the complex preparation process of this material, high technical threshold and relatively slow industrialization speed, only a few companies in some developed countries have achieved mass production. [0003] There are usually two or more raw materials required for the preparation of lithium iron phosphate materials, and each material is a solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 梅志恒孙彦军
Owner 郑州瑞普生物工程有限公司
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